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' @niet mit cran @Hina JAMES H. PORTER, OF NEW YORK, N. Y., ASSIGNOR TO FREDERIC H. NORTH, OF NEW BRITAIN, CONNECTICUT.

Lener@ Patata No. 71,640, ma December s, 1867.

dite rlgshnle rentra tain time Vsitetatat mit mating mi nf tige smite.

'.'LO ALL WHOM IT MAY GONCERN:

Be it known that I, JAMES H. PORTER, ofthe city and State of New York, have invented, made, and applied to use, a. certain new and useful Improvement in Locks;` and I do hereby declare the following to be a full, clear, and exact description of the said invention, reference being had to the annexed drawing, making part of this specification, wherein- I Figure lis a side view of one of the lock-tumblers to which my invention relates, a 'portion of one side` being shown sectionally, and

. Figure 2 isa sectional view at the line :c rv.

Similar marks of reference denote the same parts. l `My invention relates to the peculiarity of construction of a circular tumbler employed in that class of locks where a. serios of circular tumblers is used, the said tumblers having each a notch in its periphery, and the tumblers being set successively to the proper point denoted by an index outside the lock, vso that-the stud of the bolt can pass into said notches as. the`bo lt is withdrawn. I make each of said circular tuniblers in three prin- .cipal.parts, the rst being a disk carrying a'stud, the second a half circle, with a mortise hinged to the third pec'e, which is a 'similar'half `Icircle, but it has a tongue that passes into 'the said mor'tise; and an eccentric or cam is fitted soas to draw the'tongue farther into the mortise, and clamp the studjdisk between the half circles -forming the lock-tumbler. In the lock-tumbler the usual notch'to receive the stud of the bolt is provided, and,

byturning the eccentric orv cam into such a position that the stud-disk will berelieved of the clamping friction of the tumbler, the said disk can be turned, in order that the pos'ition of its stud relatively to the notch in the tumbler may be varied, and thereby change the points of indication for opening the lock.

In the drawing, a is the axis on which'the tumblers are rotated; bis the disk, and c its stud; d and e are the half circles, hinged together atf, and forming the tumbler. In the half' tumbler d is a mortise, covered by the removable cap-plate z', and o is a tongue on tho half,4 c, of the tumbler, entering the mortise in d, and'huving a. hole elongated for the reception of the eccentric or cam Z, the hubs of which occupy holes at the sides of the mortise in d," and said cam or eccentric has a polygonal hole through it for the reception of a key, by means of which the eccentric may be turned to relieve the disk b, orto clamp it firmly between the halves oZ'e forming the circular tumbler.

hWhat I claim, and desirel to secure by Letters Patent, is-=- The circular tumbler Z e, formed of two parts hinged together, in combination with the disk b, and with mechanism, substantially as specified, for drawing the parts 'of the tumbler together and clamping` said disk, as

.set forth.

In witness whereof, I have hereunto set my signature,ithis yfteenth day of June, A.-D. 1867.

J'. H. PORTER.

Witnessesz,

GEO. D. WALKER, ,i Cms. H. SMITH. 

